Dentist&#39;s device



Dec. 10, 1940. M. JEANNERET DENTIST S DEVICE Filed May 5, 1937 M Sear-mere INVENTOR K n ATTORNEY Patented Dec. 10, 1940 UNETED STATES PATENT or ies Application May 5, 1937, Serial No. 140,807 In Switzerland May 7, 1936 1 Claim.

Drillings for dental gold fillings up to a short time ago mostly were made in accordance with Blacks method of backcutting in a mitre-joint fashion for the purpose of anchoring the filling in the bore. This method, however, possessed the disadvantage that a relatively great portion of the tooth had to be removed. Of late one therefore has preferred Boissons method of anchoring the fillings by means of small studs and thus saving the body of the tooth as far as possible. For the purpose of this latter method, however, it is necessary to provide cylindrical bores with parallel axes for anchoring the said studs. The making of such cylindrical bores with accurately parallel axes, however, is a very difficult operation, since the dentist heretofore had to guide the drill free-handed and. solely could rely on his eyesight. Aside Irom these cylindrical bores with parallel axes the dentist also has to make parallel-walled cuttings or millings the free-handed execution of which also is a very diflicult afiair.

The present invention relates to a device for making parallel-walled cuttings and cylindrical bores with parallel axes in teeth, and the objects of my invention are to overcome the difficulties mentioned.

The device according to my present invention comprises a holder to be detaohably fastened to the teeth and a guide sleeve for the drill; the said sleeve being mounted on the said holder in such a way that it may be longitudinally displaced and rotatively adjusted relative to the latter.

The accompanying drawing shows two embodiments of the device according to my present invention, in which Fig. 1 is a longitudinal section through a first embodiment of the invention;

Fig. 2, a plan of the latter;

Fig. 3, a cutter belonging to the device;

Fig. 4, a drill belonging to the device; and

Fig. 5, a longitudinal section of a second embodiment of the invention.

The device shown in Figs. 1 and 2 comprises a frame or stirrup I made of metal and of U- shaped cross-section serving as holder. A pivot 3 is fastened to the web 2 of the said frame and carries a knob-shaped guide member 6 having guide faces extending ina plane at right angles to the pivot 3. A slotted guide rail 4 is mounted on the said guide member 6 longitudinally displaceable and rotatively adjustable thereto, and this rail 4 supports, at one end thereof a guide sleeve 5.

When applied, the device is set on a tooth adjacent to the tooth to be treated and, e. g., is fastened thereto by means of plaster of Paris. If the dentist has to make, e. a. parallel-walled recesses or cuts he only has to insert thecutter shown in Fig. 3 and which is connected to the drilling machine into the guide sleeve 5 and operate in any desireddirection, since the guide sleeveas indicated by the arrows in Fig. 2may be moved in a horizontal plane in any desired direction. If, in additiomhe has to drill cylindrical stud holes with parallel axes in the recess, the cutter'is replaced by the drill shown in Fig. 4 and the latter inserted into the guide sleeve 5. Since 10 the guide sleeve 5 is always displaced parallel to itself, all stud holes drilled will run parallel to each other.

As the stud holes with a clear Width of about 0.6 mm. shall not be deeper than about 1 /2 to 2 mm., a shoulder Iii is provided on the drill 8 above the drill head 9 with a diameter of about 9.8 mm. The said shoulder lfl furthermore is located at such a distance above the drill head 9 that it comes in contact with the body of the tooth when it has reached the drilling depth mentioned above, and a further penetration of the drill head is made impossible.

In the second embodiment of the invention according to Fig. ,5 the guide rail ll, here in the shape of a bar, is mounted longitudinally displaceable in a tube l2. A pin I4 connected to the said. tube I2 and engaging a longitudinal groove I3 of the said rail ll bars the latter from rotating about its longitudinal axis. The said tube l2, by

, means of a foot pin or journal I5, is rotative set into the web It of the U-shaped frame H. The said rail II at its free end is provided with the guide sleeve I8.

The device according to my present invention not only may be used in the course of filling operations but also for lining up or railing of loose teeth.

The device, furthermore, may be so adapted that it can be taken apart for the purpose of a better cleaning. Means also :may be provided for securing the guide rail in any position desired.

What I claim and desire to secure by Letters Patent is:

In a dental parallel device, a guide sleeve, a clamp for attaching the device to a single tooth other than the one to be treated, a pivot on said clamp having its axis disposed parallel to the bore in said guide sleeve, a guide member pivoted on said pivot and having guide means extending in a plane at right angles to said pivot, and an arm having one end thereof mounted on said guide member for longitudinal displacement along said guide means, said arm carrying on its free end said guide sleeve.

MAX J EANNERET. 

